US20090220361A1 - Cooling of stator for compressor - Google Patents

Cooling of stator for compressor Download PDF

Info

Publication number
US20090220361A1
US20090220361A1 US12/066,931 US6693106A US2009220361A1 US 20090220361 A1 US20090220361 A1 US 20090220361A1 US 6693106 A US6693106 A US 6693106A US 2009220361 A1 US2009220361 A1 US 2009220361A1
Authority
US
United States
Prior art keywords
cooling
stator
arrangement
housing
compressor according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/066,931
Inventor
Bjorn Lind
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lind Finance and Development AB
Original Assignee
Lind Finance and Development AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lind Finance and Development AB filed Critical Lind Finance and Development AB
Assigned to LIND FINANCE & DEVELOPMENT AB reassignment LIND FINANCE & DEVELOPMENT AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIND, BJORN
Publication of US20090220361A1 publication Critical patent/US20090220361A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/059—Roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator

Definitions

  • the present invention relates to a design for cooling an electric motor in a compressor according to the precharacterizing clause of Patent claim 1.
  • the present invention relates to cooling of an electric motor in a compressor for producing the process air required, where the compressor is supplied with energy via on the one hand an electric motor and on the other hand recovery of at least part of the energy remaining in the process air after it has passed through the fuel cells.
  • the requirements for the unit are low weight and small volume, which is achieved in part by using an efficient and low-volume cooling method. This has been achieved by the invention having been provided with the features indicated in Patent claim 1.
  • FIG. 1 shows an embodiment of the invention
  • FIG. 2 shows another embodiment of the invention
  • FIG. 3 shows a section along the line A-A in FIG. 2 .
  • 1 a and 1 b designate an essentially cylindrical housing, which has centrally the stator 3 of an electric motor connected to the housing 1 a , and an impeller 4 and a turbine wheel 5 which are interconnected by means of a common shaft 6 .
  • the common shaft 6 , bearing the impeller 4 and the turbine wheel 5 can be mounted relative to the compressor housing by any bearing method, for example fluid bearings, magnetic bearings, ball bearings or roller bearings.
  • 9 designates the rotor of an electric motor, which rotor is fastened to the shaft 6 .
  • the stator winding 2 of the electric motor is, together with its stator iron 3 , received in a space 12 in the housing 1 a , 1 b .
  • the parts 2 , 3 of the electric motor, sleeves 7 and the housing 1 a , 1 b are cooled by a coolant which is introduced through an inlet 13 , flows through the stator winding 2 and the stator iron 3 via channels 10 (winding slots) and leaves the space 12 through an outlet 14 .
  • the space 12 is sealed completely in relation to the rotating parts, the rotor 9 , the shaft 6 , with the aid of the cylindrical sealing sleeves 7 arranged between the stator winding 2 and the rotor 9 with the shaft 6 , which on the one hand seal in relation to the stator iron, the winding slots 10 of which are sealed 11 in the region between the stator winding and the rotor, and on the other hand are sealed by O rings for example in relation to the housing parts 1 a and 1 b .
  • the design of the cooling system as described contributes considerably to the compact design of the compressor. 17 indicates diagrammatically electric cables and other connections to the stator of the motor.
  • 22 designates barriers which are arranged axially in the space 12 and bring about reduced direct communication between the volumes at the inlet 13 and the outlet 14 on the right side of the stator in the figure, which form inlet and outlet volumes in order to allow the bulk of the coolant to pass via the inlet 13 through the stator to its left side and back through the stator to the outlet 14 .
  • the barriers 22 extend from the inside of the right housing end wall to the right delimitation of the stator iron 3 , which thus separates the inlet 13 from the outlet 14 in fluid terms.
  • the purpose of this design is that the coolant can be connected to the unit on only one side of the stator (the right side in FIG. 2 ).
  • the compressor and turbine housings with inlets, guide vanes and outlets are not illustrated in the drawing, but it is understood that these function in a known manner.
  • the arrow 18 thus indicates process air which is drawn in and fed out (indicated by arrow 19 ) at positive pressure to the fuel cell.
  • residual process air is dealt with (indicated by arrows 20 and 21 ) by the turbine wheel 5 , which recovers energy, which is returned to the impeller 4 in order, together with the energy supplied via the electric motor, to drive the impeller 4 .
  • the space 12 is flowed through by a coolant (inlet 13 , outlet 14 ) which cools the stator iron, the stator winding and the compressor housing 1 a , 1 b .
  • a coolant inlet 13 , outlet 14
  • these must be insulated against direct contact with the coolant as the coolant can be electrically conductive or corrosive. This can suitably be effected by means of a thin, heat-conducting protective film made of a material which is not electrically conductive and is not affected by the coolant.
  • a machinable material 16 which tolerates the coolant, has been applied firmly to the outside diameter of the stator iron before the protective film is applied, whereupon the outside diameter of the stator can be machined exactly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

Arrangement for cooling a compressor comprising a housing (Ia, Ib) with an inlet (13) and an outlet (14) and enclosing in its volume (12) a stator including stator winding (2) and stator iron (3) of an electric motor, which drives a rotor (9) with a shaft (6). The invention is characterized in that the volume (12) is arranged separated from the rotating parts (9, 6) in a sealed manner.

Description

  • The present invention relates to a design for cooling an electric motor in a compressor according to the precharacterizing clause of Patent claim 1.
  • Technology within the field of fuel cells generating electrical energy as an alternative to fossil fuels, as a primary energy source for vehicles for example, is aiming at more compact and more efficient units. The principle of fuel cells can be described very generally as hydrogen gas and oxygen reacting with one another via electrodes, generating electrical energy. The “exhaust gas product” in the reaction between hydrogen and oxygen is water. The oxygen required in the process is supplied in the form of great quantities of air at positive pressure.
  • The present invention relates to cooling of an electric motor in a compressor for producing the process air required, where the compressor is supplied with energy via on the one hand an electric motor and on the other hand recovery of at least part of the energy remaining in the process air after it has passed through the fuel cells. The requirements for the unit are low weight and small volume, which is achieved in part by using an efficient and low-volume cooling method. This has been achieved by the invention having been provided with the features indicated in Patent claim 1.
  • The invention will be described in greater detail in the form of examples with reference to the drawing, in which FIG. 1 shows an embodiment of the invention, FIG. 2 shows another embodiment of the invention and FIG. 3 shows a section along the line A-A in FIG. 2.
  • In FIG. 1 and FIG. 2, 1 a and 1 b designate an essentially cylindrical housing, which has centrally the stator 3 of an electric motor connected to the housing 1 a, and an impeller 4 and a turbine wheel 5 which are interconnected by means of a common shaft 6. The common shaft 6, bearing the impeller 4 and the turbine wheel 5, can be mounted relative to the compressor housing by any bearing method, for example fluid bearings, magnetic bearings, ball bearings or roller bearings.
  • In the drawing, 9 designates the rotor of an electric motor, which rotor is fastened to the shaft 6. The stator winding 2 of the electric motor is, together with its stator iron 3, received in a space 12 in the housing 1 a, 1 b. The parts 2, 3 of the electric motor, sleeves 7 and the housing 1 a, 1 b are cooled by a coolant which is introduced through an inlet 13, flows through the stator winding 2 and the stator iron 3 via channels 10 (winding slots) and leaves the space 12 through an outlet 14. The space 12 is sealed completely in relation to the rotating parts, the rotor 9, the shaft 6, with the aid of the cylindrical sealing sleeves 7 arranged between the stator winding 2 and the rotor 9 with the shaft 6, which on the one hand seal in relation to the stator iron, the winding slots 10 of which are sealed 11 in the region between the stator winding and the rotor, and on the other hand are sealed by O rings for example in relation to the housing parts 1 a and 1 b. The design of the cooling system as described contributes considerably to the compact design of the compressor. 17 indicates diagrammatically electric cables and other connections to the stator of the motor.
  • In FIG. 3, 22 designates barriers which are arranged axially in the space 12 and bring about reduced direct communication between the volumes at the inlet 13 and the outlet 14 on the right side of the stator in the figure, which form inlet and outlet volumes in order to allow the bulk of the coolant to pass via the inlet 13 through the stator to its left side and back through the stator to the outlet 14. Seen in FIG. 2, the barriers 22 extend from the inside of the right housing end wall to the right delimitation of the stator iron 3, which thus separates the inlet 13 from the outlet 14 in fluid terms. The purpose of this design is that the coolant can be connected to the unit on only one side of the stator (the right side in FIG. 2).
  • The compressor and turbine housings with inlets, guide vanes and outlets are not illustrated in the drawing, but it is understood that these function in a known manner. The arrow 18 thus indicates process air which is drawn in and fed out (indicated by arrow 19) at positive pressure to the fuel cell. In order to increase efficiency, residual process air is dealt with (indicated by arrows 20 and 21) by the turbine wheel 5, which recovers energy, which is returned to the impeller 4 in order, together with the energy supplied via the electric motor, to drive the impeller 4.
  • As mentioned, the space 12 is flowed through by a coolant (inlet 13, outlet 14) which cools the stator iron, the stator winding and the compressor housing 1 a, 1 b. In order to make cooling of the stator winding and the stator iron possible, these must be insulated against direct contact with the coolant as the coolant can be electrically conductive or corrosive. This can suitably be effected by means of a thin, heat-conducting protective film made of a material which is not electrically conductive and is not affected by the coolant. In order to make it possible to machine a close tolerance on the outside diameter of the stator without the stator iron being exposed, a machinable material 16, which tolerates the coolant, has been applied firmly to the outside diameter of the stator iron before the protective film is applied, whereupon the outside diameter of the stator can be machined exactly.
  • In order to make it possible to machine a close tolerance on the outside diameter of the stator without the stator iron being exposed, a machinable material which tolerates the coolant has been applied firmly to the outside diameter of the stator iron before the protective film is applied, and the outside diameter of the stator can then be machined exactly.

Claims (10)

1. An arrangement for cooling a compressor comprising a housing with an inlet and an outlet and enclosing in its volume a stator including stator winding and stator iron of an electric motor, which drives a rotor with a shaft, characterized in that the volume is arranged separated from the rotating parts in a sealed manner.
2. The arrangement for cooling a compressor according to claim 1, wherein a cooling fluid, is arranged to pass around and/or through the parts of the stator, which have been sealed, at least in the regions where the parts of the stator are exposed to contact with the cooling fluid, with a heat-conducting surface coating resistant to the cooling fluid made of a material which is not electrically conductive.
3. The arrangement for cooling a compressor according to claim 2, wherein the volume of the housing contains barriers for guiding the flow path of the cooling fluid in the housing from the inlet to the outlet of the housing.
4. The arrangement for cooling a compressor according to claim 3, wherein a turbine wheel can be coupled to the essentially electric-motor-driven impeller for returning energy recovered from the residual process air.
5. A method for sealing the rotors comprising applying a machinable material resistant to the coolant to the outside diameter of the stator, applying a sealing protective film made of a material resistant to the coolant to the stator iron and the stator winding, and machining the machinable material of the stator iron to the desired diameter.
6. The arrangement for cooling a compressor according to claim 1, wherein the volume of the housing includes internal barriers to guide the flow path of the cooling fluid in the housing from the inlet to the outlet of the housing.
7. The arrangement for cooling a compressor according to claim 6, wherein a turbine wheel is couplable to the essentially electric-motor-driven impeller for returning energy recovered from the residual process air.
8. The arrangement for cooling a compressor according to claim 7, wherein the cooling fluid includes a gas.
9. The arrangement for cooling a compressor according to claim 1, wherein the cooling fluid includes a liquid.
10. The arrangement for cooling a compressor according to claim 2, wherein the cooling fluid includes a liquid.
US12/066,931 2005-09-15 2006-09-13 Cooling of stator for compressor Abandoned US20090220361A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0502033A SE529593C2 (en) 2005-09-15 2005-09-15 Apparatus for cooling an electric motor for operating a compressor and method
SE0502033-4 2005-09-15
PCT/SE2006/050326 WO2007032737A1 (en) 2005-09-15 2006-09-13 Cooling of stator for compressor

Publications (1)

Publication Number Publication Date
US20090220361A1 true US20090220361A1 (en) 2009-09-03

Family

ID=37865227

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/066,931 Abandoned US20090220361A1 (en) 2005-09-15 2006-09-13 Cooling of stator for compressor

Country Status (3)

Country Link
US (1) US20090220361A1 (en)
SE (1) SE529593C2 (en)
WO (1) WO2007032737A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013090469A (en) * 2011-10-19 2013-05-13 Ulvac Japan Ltd Canned motor and vacuum pump
US20160141938A1 (en) * 2014-11-13 2016-05-19 Hiwin Mikrosystem Corp. Winding cooling structure of shaft motor
CN107453510A (en) * 2016-05-31 2017-12-08 中车株洲电力机车研究所有限公司 A kind of semi-open magneto
JP7531003B2 (en) 2022-03-07 2024-08-08 ドクター エンジニール ハー ツェー エフ ポルシェ アクチエンゲゼルシャフト Automotive electric motors

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8593024B2 (en) * 2010-04-12 2013-11-26 Hamilton Sundstrand Space Systems International, Inc. Implementation of a non-metallic barrier in an electric motor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060335A (en) * 1961-02-07 1962-10-23 Garrett Corp Fluid cooled dynamoelectric machine
US5922543A (en) * 1996-03-15 1999-07-13 Universitat Heidelberg Detection as chromosomal translocations by extending and ligating differentially-labeled probes Hybridized on different sides of a break-point
US6293769B1 (en) * 1999-02-03 2001-09-25 Pierburg Ag Canned pump with dry rotor compartment

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1053647B (en) * 1954-07-01 1959-03-26 Westinghouse Electric Corp Hermetically sealed, electric motor-pump unit
DE19637671C1 (en) * 1996-09-16 1998-02-12 Clouth Gummiwerke Ag Dynamoelectric machine with a cooling jacket through which liquid flows

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060335A (en) * 1961-02-07 1962-10-23 Garrett Corp Fluid cooled dynamoelectric machine
US5922543A (en) * 1996-03-15 1999-07-13 Universitat Heidelberg Detection as chromosomal translocations by extending and ligating differentially-labeled probes Hybridized on different sides of a break-point
US6293769B1 (en) * 1999-02-03 2001-09-25 Pierburg Ag Canned pump with dry rotor compartment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013090469A (en) * 2011-10-19 2013-05-13 Ulvac Japan Ltd Canned motor and vacuum pump
US20160141938A1 (en) * 2014-11-13 2016-05-19 Hiwin Mikrosystem Corp. Winding cooling structure of shaft motor
US9680354B2 (en) * 2014-11-13 2017-06-13 Hiwin Mikrosystem Corp. Winding cooling structure of shaft motor
CN107453510A (en) * 2016-05-31 2017-12-08 中车株洲电力机车研究所有限公司 A kind of semi-open magneto
JP7531003B2 (en) 2022-03-07 2024-08-08 ドクター エンジニール ハー ツェー エフ ポルシェ アクチエンゲゼルシャフト Automotive electric motors

Also Published As

Publication number Publication date
SE0502033L (en) 2007-03-16
WO2007032737A1 (en) 2007-03-22
SE529593C2 (en) 2007-09-25

Similar Documents

Publication Publication Date Title
US20080253907A1 (en) Cooling of Stator for Compressor
EP2924294B1 (en) Electric motor-driven compressor having a heat shield forming a wall of a diffuser
KR102342943B1 (en) Air compressor
EP2252797B1 (en) Compressor unit
WO2019087869A1 (en) Centrifugal compressor
US20090220361A1 (en) Cooling of stator for compressor
US6830842B2 (en) Hydrogen purged motor for anode re-circulation blower
EP3882468B1 (en) Compressor with cooled air passage and liquid coolant passage in axial heat exchanger arrangement
CN104976146A (en) Two-stage supercharging direct-drive air compressor for fuel cell engine
US20050266293A1 (en) Recirculating assembly for a fuel cell system
US11732638B2 (en) E-charger with longitudinal cooling passage
US11913473B2 (en) Compressor with electric motor coolant jacket having radial and axial portions
CN111188781A (en) Air compressor for vehicle
KR20130057900A (en) Air blower for fuel cell vehicle
KR20120027726A (en) An air blower for fuel cell vehicle
KR101673213B1 (en) An air blower for fuel cell vehicle
WO2007032740A1 (en) Stator cooling
KR20210112835A (en) Air compressor for vehicle
CN110185628B (en) Multi-medium delivery pump
KR20210115187A (en) Air compressor for car
JP7162122B2 (en) turbo machinery
CN114502844A (en) Air compressor for vehicle
CN216721042U (en) Electric pump structure for rocket engine
CN110340727A (en) A kind of electro spindle cooling jacket
EP4057484B1 (en) Compressor with electric motor coolant jacket having radial and axial portions

Legal Events

Date Code Title Description
AS Assignment

Owner name: LIND FINANCE & DEVELOPMENT AB, SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LIND, BJORN;REEL/FRAME:022977/0938

Effective date: 20080812

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION